设X1，X2，…，Xn为来自总体X的简单随机样本，其中E(X)=μ，D(X)=σ2， 发布时间：2017-03-28 12:45 │ 来源：www.tikuol.com 题型：填空题 问题： 设X1，X2，…，Xn为来自总体X的简单随机样本，其中E(X)=μ，D(X)=σ2，令U=，则ρUV=______．
题型：填空题 请认真阅读下面对话，并根据各题所给字母的提示，在标有题号的右边横线上写出一个英语单词的完整、正确的形式，使对话通顺。A: Nowadays, doctors can do a great job transplanting organs such as the heart. As (76)m science develops, I am sure that it will be several years (77)b_____ doctors are able to transplant human brains.B: I think you are right about that, but transplanting brains and transplanting memories are not (78)a_____ the same.A: Why not? Our memories are in our brain, aren’t they?B: Yes. But it is not clear whether the memories will still be there if you transplant the brain.A: Well, I (79)s_____ so. Why shouldn’t they?B: They may still be there. (80)B_____, in what other way could we then transplant memories?A: Memories may be downloaded like a (81)c______.B: Oh, what you said is (82)b____ my imagination. But how would that (83)a_______ our society?A: Well, it would be great. We could (84)c_____ down all schools. People would not need to learn any more because (85)k__________could also be transplanted. 小题1: 小题2: 小题3: 小题4: 小题5: 小题6: 小题7: 小题8: 小题9: 小题10: 查看答案
题型：填空题 某工厂已在一周前对全厂职工作过健康检查，检查项目包括内科检查：肝功能、B超、血常规、心电图、胸部X线透视。在对该厂三硝基甲苯接触工人的健康检查时，还必须补充进行（）。A.拍摄X线胸片B.脑电图检查C.肾功能检查D.眼科检查E.肺功能检查 查看答案
，则ρUV=______．，则ρUV=______．